A novel cleaning process for industrial production of xylose in pilot scale from corncob by using screw-steam-explosive extruder
| Autor: | Qiu-Xiang Zhang, Xue-Liang Qiu, Fan Xiaoguang, Zhang Hongjia, Dong-Sheng Wei, Qipeng Yuan, Li-Hong Deng, Shuang-Xi Li, Wen-Ya Wang, Mattheos A. G. Koffas |
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| Rok vydání: | 2013 |
| Předmět: |
Time Factors
Formic acid Industrial Waste Bioengineering Corncob Xylose Wastewater Lignin Zea mays chemistry.chemical_compound Hydrolysis Polysaccharides Pressure Hemicellulose Biomass Steam explosion Ions Waste management Phenol Temperature Sulfuric acid General Medicine Equipment Design Hydrogen-Ion Concentration Sulfuric Acids Biorefinery Pulp and paper industry Carbon Steam chemistry Crystallization Biotechnology |
| Zdroj: | Bioprocess and biosystems engineering. 37(12) |
| ISSN: | 1615-7605 |
| Popis: | Steam explosion is the most promising technology to replace conventional acid hydrolysis of lignocellulose for biomass pretreatment. In this paper, a new screw-steam-explosive extruder was designed and explored for xylose production and lignocellulose biorefinery at the pilot scale. We investigated the effect of different chemicals on xylose yield in the screw-steam-explosive extrusion process, and the xylose production process was optimized as followings: After pre-impregnation with sulfuric acid at 80 °C for 3 h, corncob was treated at 1.55 MPa with 9 mg sulfuric acid/g dry corncob (DC) for 5.5 min, followed by countercurrent extraction (3 recycles), decoloration (activated carbon dosage 0.07 g/g sugar, 75 °C for 40 min), and ion exchange (2 batches). Using this process, 3.575 kg of crystal xylose was produced from 22 kg corncob, almost 90 % of hemicellulose was released as monomeric sugar, and only a small amount of by-products was released (formic acid, acetic acid, fural, 5-hydroxymethylfurfural, and phenolic compounds were 0.17, 1.14, 0.53, 0.19, and 1.75 g/100 g DC, respectively). All results indicated that the screw-steam-explosive extrusion provides a more effective way to convert hemicellulose into xylose and could be an alternative method to traditional sulfuric acid hydrolysis process for lignocellulose biorefinery. |
| Databáze: | OpenAIRE |
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